Important Charging Notes - DeWalt DW902 Instruction Manual

PROBLEM POWER LINE
Some chargers have a Problem Power Line indicator. When the
charger is used with some portable power sources such as
generators or sources that convert DC to AC, the charger may
temporarily suspend operation, flashing the red light with two
fast blinks followed by a pause. This indicates the power source
is out of limits.
HOT/COLD PACK DELAY
Some chargers have a Hot/Cold Pack Delay feature: when the
charger detects a battery that is hot, it automatically starts a Hot
Pack Delay, suspending charging until the battery has cooled. After
the battery has cooled, the charger automatically switches to the
Pack Charging mode. This feature ensures maximum battery life.
The red light flashes long, then short while in the Hot Pack Delay
mode.
15 MINUTE CHARGERS
1. Plug the charger into an appropriate power outlet. The charger
will beep twice, the red light will blink and go off.
2. Insert the battery pack into the charger, as shown in FIG. 1,
making sure the pack is fully seated in the charger. The red light
will blink and the charger will beep once indicating the charging
process has started.
3. The battery pack will be fully charged in less than 15 minutes
under most conditions. This will be indicated by the red light
remaining on and 3 beeps. The pack is fully charged and may
be used at this time or left in the charger.
ALL CHARGERS
Leaving the battery pack in the charger: When the red light
remains on, the charger has switched to its "equalize charge" mode
which lasts approximately 4 hours, after which the charger will
switch to "maintenance charge" mode. The battery pack can be
removed at any time during these charge cycles, but will only be
fully charged if the red light is continuously on. The charger and bat-
tery pack can be left connected with the red light glowing indefi-
nitely. The charger will keep the battery pack fresh and fully
charged. A battery pack will slowly lose its charge when kept out of
the charger. If the battery pack has not been kept on maintenance
charge, it may need to be recharged before use. A battery pack
may also slowly lose its charge if left in a charger that is not plugged
into an appropriate AC source.
WEAK BATTERY PACKS: Chargers can also detect a weak bat-
tery. Such batteries are still usable but should not be expected to
perform as much work. In such cases, about 10 seconds after bat-
tery insertion, the charger will beep rapidly 8 times to indicate a
weak battery condition. The charger will then go on to charge the
battery to the highest capacity possible.

Important Charging Notes

1. Longest life and best performance can be obtained if the battery
pack is charged when the air temperature is between 65°F and
75°F (18°- 24°C). DO NOT charge the battery pack in an air
temperature below +40°F(+4.5°C), or above +105°F (+40.5°C).
This is important and will prevent serious damage to the battery
pack.
2. The charger and battery pack may become warm to touch while
charging. This is a normal condition, and does not indicate a
problem.
3. If the battery pack does not charge properly — (1) Check current
at receptacle by plugging in a lamp or other appliance, (2) Check
to see if receptacle is connected to a light switch which turns
power off when you turn out the lights. (3) Move charger and
battery pack to a location where the surrounding air temperature
is approximately 65°F - 75°F (18°- 24°C). (4) If charging
problems persist, take or send the tool, battery pack and charger
to your local service center.
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